Grain-Size Effects on the High-Temperature Oxidation of Cu added Austenitic stainless steel

Title
Grain-Size Effects on the High-Temperature Oxidation of Cu added Austenitic stainless steel
Authors
김주헌김동익Satyam Suwas에릭플러리이경우
Keywords
austenitic stainless steel; grain size effect; oxidation resistance; grain boundary
Issue Date
2012-05
Publisher
8th International Symposium on High-Temperature Corrosion and Protection of Materials
Abstract
High temperature oxidation behavior of Cu-added austenitic stainless steels in a water vapor atmosphere was investigated. Samples were prepared by various thermo mechanical treatments to make different grain size (8~30μm). Similar Σ3 grain boundary fraction was achieved to eliminate the grain boundary characteristics effect. Samples were oxidized in an air furnace at 700°C with 20% water vapor atmosphere. On the fine grained sample, uniform Cr2O3 layer was formed, which increased the overall oxidation resistance. Whereas on the coarse grained sample, additional Fe2O3 layer was formed on the Cr-rich oxide layer, which resulted in a relatively high oxidation rate. In fine grained sample, grain boundaries act as rapid diffusion paths for Cr and provide enough Cr to form Cr2O3 oxide on the entire sample surface.
URI
http://pubs.kist.re.kr/handle/201004/44078
Appears in Collections:
KIST Publication > Conference Paper
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